Superheater.



H'. B. OTLEY @I N. T. McKEE.

SUPERHEATER.

APPLICATION FILED MAR. 22, IsIe.

Patented Jan. 2, 1917.

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M f77 M Syvum/drow HENRY B. earner,- or rnnsnrne, Ann unan Menen.

assroirons 'ro Looolvorr'vn snrnnnnarnn contri-intr, or un CGRPQRATIQNDF DELAW'ARE.

lllhlil. i Specification er" Letters Patent.

o, Application filed March, 1916. Serial No.` 86,033.

To all ywhom t may cof/cern Be it known that we, HENRY B. OATLEY andNEAL T. Mclnn, both. citizens of the United States, and residing,respectively, at Flushing, county of Queens, State of New York, and atYonkers, county of llestchester, State o N ew lYork, have. inventedcertain new and useful lmproveiuentsin Supen specifi;

heaters, cation.

of which :the following is a Qur invention relates 'sfu reverses itsdirection just before reachingA the irebox, flows forward,'isagainreversed in a second return bend, travels again to- H ward the tirebox, being once more reversed and traveling forward and into a secondcompartment of the header, whence it 1s carried to the cylinders. l Thisis well known, to those skilled in'this art. ln the majority of casesthe second return bend is located well forward, usually being` actuallyin the sinokebox. Under some circumstances and for certain reasons itmay become desirable to make the second and third lengths shorter andlocate the second return bend somedistance back from the liront 'Huesheet. The exact location is not important for purposes of the presentinvention.

llith the arrangement as thus 'far described certain disadvantages arisewhich it is the object of the present invention to overcome.

rlhe invention will he best understood by reference to the accompanyingdrawing, wherein- Figure l is a side elevation of a unit einbodying ourinvention with so inuch of the boiler shown, partly in section andpartly in elevation, as is required toshow the relation of the two; Fig.2 is an enlarged top View ot portions ofthe units oit'Figs.y 3 and`ilerheaters 01"" the type usually known as sinclie tune super ders. It'the return bend l0 locate Sonie distance, from the` front thie i freesection for the passage or vpower of the hot ga Aanylsoot, ashes, andother i the unit located in its flue, the latter in section; Fig. 3 is'a View, siinilar to Fis. of a modification; while Figs; e and 5 arerespectively still inore enlarged sectional views of .ln all sa certainportions are broken of the views away.

' tivelyv n l V; anda, be.'` enlrf' i the supcrheater 4lil'hile only oneuni s of course undorstomit" d nuinl'ier oit such u lhe'ends, t?, 3' ot'any nro i'erred nin i* header re; dry pipethe ste-aro has traversed thesuper er units and has returned. to the 7 header` it cares at 9 tortheengine above hot g experiences a C ulden-changre at this i lllhereasthere are four tul'ics ot the i'. the flue up tothis point, there are o.from this point forward.- -As a res-.nt the flow ot the hotgasesexperiences a corre- 85 spending,` sudden diminution of T his checkin relocitv these are therefore dropped an: at this one point. The povercomes this serious defect effective nianner.

Two lengths or tubing :Le to the return bend lO, bein,- welded o'e wiseunited to it, and ferr g c tions of the two tube lengths ufluf` nectedto return hond l0, .vithout, however, the wall of the return bend beingA reed in any way. There is thus no coinrn=,1""ation between the tubesll and the inside of the super-heater unit. riilhis will he clearespecialljyY from Fig. The effect the hot gases in the riue concer--vethat their velocity receives no sudd but diminishes normally with theircooling, just as is the case when reto l0 is located at or forward ort'the front flue sheet.

ln the modiiication shoifvn his 4 the return bend 10 is left in itsusual position just forward of the front Hue sheet; but the two tubelengths which it connects are further connected by a cross-connection ata point 12,` the exact location of which is again a matter of choice,determined mainly by the boiler proportions. By properly proportioningthe size of the crossconnection 12Vthe relative amounts of Steam passingthrough it and through return bend 10 respectively can be madepractically whatever we please. By making it large enough, the steam inthe part of the unit forward of this point is practically stagnant, allof the steam going to the cylinders passing through 12. That part of theunit forward of 12 therefore adds nothing to the superheat of the steam,but does fulfil the requirement of keeping constant the freecross-section for the hot gases. In practice it will prove desirable tomake the relative size of cross-connection 12 such that enough steampasses by way of return bend 10 to protect the latter from injury by thehot gases.

1Certain modifications are evidently possib e.

` scribed may be closed at their front ends,

variations-evidently come within the spirit of the followin claims.`What we claim' and desire to secure by Letters Patent is:

l, The combination of a Hue, Aa superheater unit of the class describedwithin said Hue, said unit comprising means to change the direction ofHow of Steam through it at a point remote from the ends of the Hue andtwo tubes attached to said opies of this patent may be obtained for Thusthe tubes l1 in the form first de.

the Hue, the first and the last tube lengths being connected directly tothe header, and

two pipe lengths extending forward from said middle return bend in suchmanner that their axes are in line respectlvely with the axes of the twotube lengths opening into said middle return bend.

3. In a boiler, the combination of a Hue,`

a header, a superheater unit located within ,Y V bend being remote fromthe front end of.V

said flue, and comprising four tube lengths;

means connecting theirstto the second, the

second to the third, andthe third to' 'the fourth length, the Hrst andthe fourth-1- lengths being connected directly to the header, the meansconnecting the second* to the third length being located at a pointremote from the front end of the Huefandf;

portions independent of the Hrst and fourth lengths extending forwardfrom said last mentioned means and each having the same cross-sectionaloutline as the tube lengths.

4. In a boiler, the combination Of a Hue, a header, a superheater unitof the class def prising four lengths,'two of saidlengths f f f scribedlocated within said Hue and comcommunicating at one end directly withthe header and at the other end with the re- .Y i, y.

maining two lengths, said'remaining two..

lengths communicating with each other lat a point remote from'the frontend of the Hue; and two pipe lengths united toV the f unit in suchmanner that their axes coin-- eide with those of the tube length lastmentioned, their interior however not communicating with the interior.of the unit.

- HENRY B. oafrnnr.y j

- NEAL T. MCKEE. f

ve cents each, by,mdli'e'ssiugl the Commissioner of retient, 'iWasmngtnn DIC. v y v

